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FAILED: patch "[PATCH] scsi: target: pscsi: Set SCF_TREAT_READ_AS_NORMAL flag only" failed to apply to 5.17-stable tree

PATCH [email protected] 1 participant 1 message May 2, 2022

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The patch below does not apply to the 5.17-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8be70a842f70c0fe8e00fd488b1966344fa10ff4 Mon Sep 17 00:00:00 2001
From: David Jeffery <[email protected]>
Date: Wed, 27 Apr 2022 14:32:50 -0400
Subject: [PATCH] scsi: target: pscsi: Set SCF_TREAT_READ_AS_NORMAL flag only
if there is valid data

With tape devices, the SCF_TREAT_READ_AS_NORMAL flag is used by the target subsystem to mark commands which have both data to return as well as sense data. But with pscsi, SCF_TREAT_READ_AS_NORMAL can be set even if there is no data to return. The SCF_TREAT_READ_AS_NORMAL flag causes the target core to call iscsit data-in callbacks even if there is no data, which iscsit does not support. This results in iscsit going into an error state requiring recovery and being unable to complete the command to the initiator.

This issue can be resolved by fixing pscsi to only set SCF_TREAT_READ_AS_NORMAL if there is valid data to return alongside the sense data.

Link https://lore.kernel.org/r/[email protected] open here
Fixes bd81372065fa ("scsi: target: transport should handle st FM/EOM/ILI reads")
Reported-by Scott Hamilton <[email protected]>
Tested-by Laurence Oberman <[email protected]>
Reviewed-by Laurence Oberman <[email protected]>
Signed-off-by David Jeffery <[email protected]>
Signed-off-by Martin K. Petersen <[email protected]>
drivers/target/target_core_pscsi.c +5 -5
index ff292b75e23f..60dafe4c581b 100644
@@ -588,7 +588,7 @@ static void pscsi_destroy_device(struct se_device *dev)
 }
 
 static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
-			       unsigned char *req_sense)
+			       unsigned char *req_sense, int valid_data)
 {
 	struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
 	struct scsi_device *sd = pdv->pdv_sd;

@@ -681,7 +681,7 @@ static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
 		 * back despite framework assumption that a
 		 * check condition means there is no data
 		 */
-		if (sd->type == TYPE_TAPE &&
+		if (sd->type == TYPE_TAPE && valid_data &&
 		    cmd->data_direction == DMA_FROM_DEVICE) {
 			/*
 			 * is sense data valid, fixed format,

@@ -1032,6 +1032,7 @@ static void pscsi_req_done(struct request *req, blk_status_t status)
 	struct se_cmd *cmd = req->end_io_data;
 	struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
 	enum sam_status scsi_status = scmd->result & 0xff;
+	int valid_data = cmd->data_length - scmd->resid_len;
 	u8 *cdb = cmd->priv;
 
 	if (scsi_status != SAM_STAT_GOOD) {

@@ -1039,12 +1040,11 @@ static void pscsi_req_done(struct request *req, blk_status_t status)
 			" 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result);
 	}
 
-	pscsi_complete_cmd(cmd, scsi_status, scmd->sense_buffer);
+	pscsi_complete_cmd(cmd, scsi_status, scmd->sense_buffer, valid_data);
 
 	switch (host_byte(scmd->result)) {
 	case DID_OK:
-		target_complete_cmd_with_length(cmd, scsi_status,
-			cmd->data_length - scmd->resid_len);
+		target_complete_cmd_with_length(cmd, scsi_status, valid_data);
 		break;
 	default:
 		pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"